EDIT: This applies for version 1.0.45 - newer versions may fix the issues I describe here.

Maybe some new users are also considering using Manuscripts for their next assignment, so I'd thought I share my experience so both new users and matt can profit.

I started playing with Manuscripts because design concepts and philosophy are great, and I really could use a tool like this. I liked it so much I even shelled out my $ to support it!

Last week I had to write a 25 page assignment, it included maths and images. I thought it would be a great chance to Manuscripts and see how it'd perform in real life.

You will find lots of bugs and crashes, and be prepared to rewrite some sections (even though you just saved it a couple minutes before the crash, that great paragraph won't be there the next time you open your file).

Copy pasting to your other favorite text editor won't work either as a backup, as you can't tell what's been yanked and what's not being copied to the clipboard.

Even when you decide to export to your other favorite writing app because you just need to go ahead and stop fighting bugs, you will have to rewrite lots of stuff, and formatting will be painful.

Submitting bugs usually gets them fixed in a couple of incremental releases, but they take time.

(may not apply if you don't use equations) equation writing and handling is very very buggy.

Matt's support and bug squashing capabilities are amazing, but I think usability is not just at 1.0 level, its somewhere between alpha/beta. So I went back to my old latex editor. It lacks most of the cool features introduced with Manuscripts but it's rock solid and provides a deterministic behavior.

TL;DR: Manuscripts has great potential but be ready to deal with lots of bugs, crashes and rewriting. So be careful when choosing it to write that hard deadline assignment, you may want to prefer your good old latex editor.
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@clausqr I appreciate you taking the time to write feedback to us! In terms of stability, as an overall statistic Manuscripts is really reaching rather good stability figures (sub-1% crash rate). We've done a lot of stability work especially in past weeks, leading up to the very last week, as we did also on reliability of the kind you describe, and indeed on equations both inline and paragraph level received updates based on what's been reported to us (indeed paragraph level equation insertion had issues still until recent point releases where they could lead to other inconsistencies). That is little consolation if the app crashes for you, and indeed the issue could be with the particular document at which case us receiving it via support@manuscriptsapp.com helps us diagnose things (as you note issues especially with adding equations).

Another important factor you should be aware of is that just yesterday we discovered an issue with Manuscripts compatibility with OSX 10.11.2 (and its later beta versions): copy and paste, and PDF export via LaTeX were affected specifically there. As soon as we (finally) understood the pattern yesterday, we reported the specific underlying bug to Apple and provide a compatibility fix that works around the OS level issue in the form of 1.0.30 made available last night.

Any specific issues you have been hit by, including but not limited equations which you note as being problematic, would be great to hear about. If you're more comfortable with contacting us via support@manuscriptsapp.com for more detail or simply there's an issue we have not responded to or followed up on via that route, please just flag that to us that route and we'll be sure to take a look. Again, thanks for sending us your feedback!